Commit | Line | Data |
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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
20ca73bc | 6 | * Copyright (C) 2005, 2006 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
20ca73bc GW |
32 | * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, |
33 | * 2006. | |
34 | * | |
b63862f4 DK |
35 | * The support of additional filter rules compares (>, <, >=, <=) was |
36 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
37 | * | |
73241ccc AG |
38 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
39 | * filesystem information. | |
8c8570fb DK |
40 | * |
41 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
42 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
43 | */ |
44 | ||
45 | #include <linux/init.h> | |
1da177e4 | 46 | #include <asm/types.h> |
715b49ef | 47 | #include <asm/atomic.h> |
73241ccc AG |
48 | #include <asm/types.h> |
49 | #include <linux/fs.h> | |
50 | #include <linux/namei.h> | |
1da177e4 LT |
51 | #include <linux/mm.h> |
52 | #include <linux/module.h> | |
01116105 | 53 | #include <linux/mount.h> |
3ec3b2fb | 54 | #include <linux/socket.h> |
20ca73bc | 55 | #include <linux/mqueue.h> |
1da177e4 LT |
56 | #include <linux/audit.h> |
57 | #include <linux/personality.h> | |
58 | #include <linux/time.h> | |
5bb289b5 | 59 | #include <linux/netlink.h> |
f5561964 | 60 | #include <linux/compiler.h> |
1da177e4 | 61 | #include <asm/unistd.h> |
8c8570fb | 62 | #include <linux/security.h> |
fe7752ba | 63 | #include <linux/list.h> |
a6c043a8 | 64 | #include <linux/tty.h> |
3dc7e315 | 65 | #include <linux/selinux.h> |
473ae30b | 66 | #include <linux/binfmts.h> |
f46038ff | 67 | #include <linux/syscalls.h> |
1da177e4 | 68 | |
fe7752ba | 69 | #include "audit.h" |
1da177e4 | 70 | |
fe7752ba | 71 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
72 | |
73 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
74 | extern int audit_enabled; | |
75 | ||
76 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
77 | * for saving names from getname(). */ | |
78 | #define AUDIT_NAMES 20 | |
79 | ||
80 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
81 | * audit_context from being used for nameless inodes from | |
82 | * path_lookup. */ | |
83 | #define AUDIT_NAMES_RESERVED 7 | |
84 | ||
1da177e4 LT |
85 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
86 | * we don't let putname() free it (instead we free all of the saved | |
87 | * pointers at syscall exit time). | |
88 | * | |
89 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
90 | struct audit_names { | |
91 | const char *name; | |
92 | unsigned long ino; | |
73241ccc | 93 | unsigned long pino; |
1da177e4 LT |
94 | dev_t dev; |
95 | umode_t mode; | |
96 | uid_t uid; | |
97 | gid_t gid; | |
98 | dev_t rdev; | |
1b50eed9 | 99 | u32 osid; |
1da177e4 LT |
100 | }; |
101 | ||
102 | struct audit_aux_data { | |
103 | struct audit_aux_data *next; | |
104 | int type; | |
105 | }; | |
106 | ||
107 | #define AUDIT_AUX_IPCPERM 0 | |
108 | ||
20ca73bc GW |
109 | struct audit_aux_data_mq_open { |
110 | struct audit_aux_data d; | |
111 | int oflag; | |
112 | mode_t mode; | |
113 | struct mq_attr attr; | |
114 | }; | |
115 | ||
116 | struct audit_aux_data_mq_sendrecv { | |
117 | struct audit_aux_data d; | |
118 | mqd_t mqdes; | |
119 | size_t msg_len; | |
120 | unsigned int msg_prio; | |
121 | struct timespec abs_timeout; | |
122 | }; | |
123 | ||
124 | struct audit_aux_data_mq_notify { | |
125 | struct audit_aux_data d; | |
126 | mqd_t mqdes; | |
127 | struct sigevent notification; | |
128 | }; | |
129 | ||
130 | struct audit_aux_data_mq_getsetattr { | |
131 | struct audit_aux_data d; | |
132 | mqd_t mqdes; | |
133 | struct mq_attr mqstat; | |
134 | }; | |
135 | ||
1da177e4 LT |
136 | struct audit_aux_data_ipcctl { |
137 | struct audit_aux_data d; | |
138 | struct ipc_perm p; | |
139 | unsigned long qbytes; | |
140 | uid_t uid; | |
141 | gid_t gid; | |
142 | mode_t mode; | |
9c7aa6aa | 143 | u32 osid; |
1da177e4 LT |
144 | }; |
145 | ||
473ae30b AV |
146 | struct audit_aux_data_execve { |
147 | struct audit_aux_data d; | |
148 | int argc; | |
149 | int envc; | |
150 | char mem[0]; | |
151 | }; | |
152 | ||
3ec3b2fb DW |
153 | struct audit_aux_data_socketcall { |
154 | struct audit_aux_data d; | |
155 | int nargs; | |
156 | unsigned long args[0]; | |
157 | }; | |
158 | ||
159 | struct audit_aux_data_sockaddr { | |
160 | struct audit_aux_data d; | |
161 | int len; | |
162 | char a[0]; | |
163 | }; | |
164 | ||
01116105 SS |
165 | struct audit_aux_data_path { |
166 | struct audit_aux_data d; | |
167 | struct dentry *dentry; | |
168 | struct vfsmount *mnt; | |
169 | }; | |
1da177e4 LT |
170 | |
171 | /* The per-task audit context. */ | |
172 | struct audit_context { | |
173 | int in_syscall; /* 1 if task is in a syscall */ | |
174 | enum audit_state state; | |
175 | unsigned int serial; /* serial number for record */ | |
176 | struct timespec ctime; /* time of syscall entry */ | |
177 | uid_t loginuid; /* login uid (identity) */ | |
178 | int major; /* syscall number */ | |
179 | unsigned long argv[4]; /* syscall arguments */ | |
180 | int return_valid; /* return code is valid */ | |
2fd6f58b | 181 | long return_code;/* syscall return code */ |
1da177e4 LT |
182 | int auditable; /* 1 if record should be written */ |
183 | int name_count; | |
184 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
185 | struct dentry * pwd; |
186 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
187 | struct audit_context *previous; /* For nested syscalls */ |
188 | struct audit_aux_data *aux; | |
189 | ||
190 | /* Save things to print about task_struct */ | |
f46038ff | 191 | pid_t pid, ppid; |
1da177e4 LT |
192 | uid_t uid, euid, suid, fsuid; |
193 | gid_t gid, egid, sgid, fsgid; | |
194 | unsigned long personality; | |
2fd6f58b | 195 | int arch; |
1da177e4 LT |
196 | |
197 | #if AUDIT_DEBUG | |
198 | int put_count; | |
199 | int ino_count; | |
200 | #endif | |
201 | }; | |
202 | ||
f368c07d | 203 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
204 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
205 | * otherwise. */ | |
206 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 207 | struct audit_krule *rule, |
1da177e4 | 208 | struct audit_context *ctx, |
f368c07d | 209 | struct audit_names *name, |
1da177e4 LT |
210 | enum audit_state *state) |
211 | { | |
2ad312d2 | 212 | int i, j, need_sid = 1; |
3dc7e315 DG |
213 | u32 sid; |
214 | ||
1da177e4 | 215 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 216 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
217 | int result = 0; |
218 | ||
93315ed6 | 219 | switch (f->type) { |
1da177e4 | 220 | case AUDIT_PID: |
93315ed6 | 221 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 222 | break; |
3c66251e AV |
223 | case AUDIT_PPID: |
224 | if (ctx) | |
225 | result = audit_comparator(ctx->ppid, f->op, f->val); | |
226 | break; | |
1da177e4 | 227 | case AUDIT_UID: |
93315ed6 | 228 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
229 | break; |
230 | case AUDIT_EUID: | |
93315ed6 | 231 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
232 | break; |
233 | case AUDIT_SUID: | |
93315ed6 | 234 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
235 | break; |
236 | case AUDIT_FSUID: | |
93315ed6 | 237 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
238 | break; |
239 | case AUDIT_GID: | |
93315ed6 | 240 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
241 | break; |
242 | case AUDIT_EGID: | |
93315ed6 | 243 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
244 | break; |
245 | case AUDIT_SGID: | |
93315ed6 | 246 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
247 | break; |
248 | case AUDIT_FSGID: | |
93315ed6 | 249 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
250 | break; |
251 | case AUDIT_PERS: | |
93315ed6 | 252 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 253 | break; |
2fd6f58b | 254 | case AUDIT_ARCH: |
b63862f4 | 255 | if (ctx) |
93315ed6 | 256 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 257 | break; |
1da177e4 LT |
258 | |
259 | case AUDIT_EXIT: | |
260 | if (ctx && ctx->return_valid) | |
93315ed6 | 261 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
262 | break; |
263 | case AUDIT_SUCCESS: | |
b01f2cc1 | 264 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
265 | if (f->val) |
266 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 267 | else |
93315ed6 | 268 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 269 | } |
1da177e4 LT |
270 | break; |
271 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
272 | if (name) |
273 | result = audit_comparator(MAJOR(name->dev), | |
274 | f->op, f->val); | |
275 | else if (ctx) { | |
1da177e4 | 276 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 277 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
278 | ++result; |
279 | break; | |
280 | } | |
281 | } | |
282 | } | |
283 | break; | |
284 | case AUDIT_DEVMINOR: | |
f368c07d AG |
285 | if (name) |
286 | result = audit_comparator(MINOR(name->dev), | |
287 | f->op, f->val); | |
288 | else if (ctx) { | |
1da177e4 | 289 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 290 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
291 | ++result; |
292 | break; | |
293 | } | |
294 | } | |
295 | } | |
296 | break; | |
297 | case AUDIT_INODE: | |
f368c07d AG |
298 | if (name) |
299 | result = (name->ino == f->val || | |
300 | name->pino == f->val); | |
301 | else if (ctx) { | |
1da177e4 | 302 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 AG |
303 | if (audit_comparator(ctx->names[j].ino, f->op, f->val) || |
304 | audit_comparator(ctx->names[j].pino, f->op, f->val)) { | |
1da177e4 LT |
305 | ++result; |
306 | break; | |
307 | } | |
308 | } | |
309 | } | |
310 | break; | |
f368c07d AG |
311 | case AUDIT_WATCH: |
312 | if (name && rule->watch->ino != (unsigned long)-1) | |
313 | result = (name->dev == rule->watch->dev && | |
314 | (name->ino == rule->watch->ino || | |
315 | name->pino == rule->watch->ino)); | |
316 | break; | |
1da177e4 LT |
317 | case AUDIT_LOGINUID: |
318 | result = 0; | |
319 | if (ctx) | |
93315ed6 | 320 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 321 | break; |
3dc7e315 DG |
322 | case AUDIT_SE_USER: |
323 | case AUDIT_SE_ROLE: | |
324 | case AUDIT_SE_TYPE: | |
325 | case AUDIT_SE_SEN: | |
326 | case AUDIT_SE_CLR: | |
327 | /* NOTE: this may return negative values indicating | |
328 | a temporary error. We simply treat this as a | |
329 | match for now to avoid losing information that | |
330 | may be wanted. An error message will also be | |
331 | logged upon error */ | |
2ad312d2 SG |
332 | if (f->se_rule) { |
333 | if (need_sid) { | |
334 | selinux_task_ctxid(tsk, &sid); | |
335 | need_sid = 0; | |
336 | } | |
3dc7e315 DG |
337 | result = selinux_audit_rule_match(sid, f->type, |
338 | f->op, | |
339 | f->se_rule, | |
340 | ctx); | |
2ad312d2 | 341 | } |
3dc7e315 | 342 | break; |
1da177e4 LT |
343 | case AUDIT_ARG0: |
344 | case AUDIT_ARG1: | |
345 | case AUDIT_ARG2: | |
346 | case AUDIT_ARG3: | |
347 | if (ctx) | |
93315ed6 | 348 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 LT |
349 | break; |
350 | } | |
351 | ||
1da177e4 LT |
352 | if (!result) |
353 | return 0; | |
354 | } | |
355 | switch (rule->action) { | |
356 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
357 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
358 | } | |
359 | return 1; | |
360 | } | |
361 | ||
362 | /* At process creation time, we can determine if system-call auditing is | |
363 | * completely disabled for this task. Since we only have the task | |
364 | * structure at this point, we can only check uid and gid. | |
365 | */ | |
366 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
367 | { | |
368 | struct audit_entry *e; | |
369 | enum audit_state state; | |
370 | ||
371 | rcu_read_lock(); | |
0f45aa18 | 372 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 373 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
374 | rcu_read_unlock(); |
375 | return state; | |
376 | } | |
377 | } | |
378 | rcu_read_unlock(); | |
379 | return AUDIT_BUILD_CONTEXT; | |
380 | } | |
381 | ||
382 | /* At syscall entry and exit time, this filter is called if the | |
383 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 384 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 385 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
386 | */ |
387 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
388 | struct audit_context *ctx, | |
389 | struct list_head *list) | |
390 | { | |
391 | struct audit_entry *e; | |
c3896495 | 392 | enum audit_state state; |
1da177e4 | 393 | |
351bb722 | 394 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
395 | return AUDIT_DISABLED; |
396 | ||
1da177e4 | 397 | rcu_read_lock(); |
c3896495 | 398 | if (!list_empty(list)) { |
b63862f4 DK |
399 | int word = AUDIT_WORD(ctx->major); |
400 | int bit = AUDIT_BIT(ctx->major); | |
401 | ||
402 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
403 | if ((e->rule.mask[word] & bit) == bit && |
404 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
405 | &state)) { | |
406 | rcu_read_unlock(); | |
407 | return state; | |
408 | } | |
409 | } | |
410 | } | |
411 | rcu_read_unlock(); | |
412 | return AUDIT_BUILD_CONTEXT; | |
413 | } | |
414 | ||
415 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
416 | * collected during syscall processing. We only check rules in sublists at hash | |
417 | * buckets applicable to the inode numbers in audit_names[]. | |
418 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
419 | */ | |
420 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
421 | struct audit_context *ctx) | |
422 | { | |
423 | int i; | |
424 | struct audit_entry *e; | |
425 | enum audit_state state; | |
426 | ||
427 | if (audit_pid && tsk->tgid == audit_pid) | |
428 | return AUDIT_DISABLED; | |
429 | ||
430 | rcu_read_lock(); | |
431 | for (i = 0; i < ctx->name_count; i++) { | |
432 | int word = AUDIT_WORD(ctx->major); | |
433 | int bit = AUDIT_BIT(ctx->major); | |
434 | struct audit_names *n = &ctx->names[i]; | |
435 | int h = audit_hash_ino((u32)n->ino); | |
436 | struct list_head *list = &audit_inode_hash[h]; | |
437 | ||
438 | if (list_empty(list)) | |
439 | continue; | |
440 | ||
441 | list_for_each_entry_rcu(e, list, list) { | |
442 | if ((e->rule.mask[word] & bit) == bit && | |
443 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
444 | rcu_read_unlock(); |
445 | return state; | |
446 | } | |
0f45aa18 DW |
447 | } |
448 | } | |
449 | rcu_read_unlock(); | |
1da177e4 | 450 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
451 | } |
452 | ||
f368c07d AG |
453 | void audit_set_auditable(struct audit_context *ctx) |
454 | { | |
455 | ctx->auditable = 1; | |
456 | } | |
457 | ||
1da177e4 LT |
458 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
459 | int return_valid, | |
460 | int return_code) | |
461 | { | |
462 | struct audit_context *context = tsk->audit_context; | |
463 | ||
464 | if (likely(!context)) | |
465 | return NULL; | |
466 | context->return_valid = return_valid; | |
467 | context->return_code = return_code; | |
468 | ||
21af6c4f | 469 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 470 | enum audit_state state; |
f368c07d | 471 | |
0f45aa18 | 472 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
473 | if (state == AUDIT_RECORD_CONTEXT) { |
474 | context->auditable = 1; | |
475 | goto get_context; | |
476 | } | |
477 | ||
478 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
479 | if (state == AUDIT_RECORD_CONTEXT) |
480 | context->auditable = 1; | |
f368c07d | 481 | |
1da177e4 LT |
482 | } |
483 | ||
f368c07d | 484 | get_context: |
1da177e4 | 485 | context->pid = tsk->pid; |
f46038ff | 486 | context->ppid = sys_getppid(); /* sic. tsk == current in all cases */ |
1da177e4 LT |
487 | context->uid = tsk->uid; |
488 | context->gid = tsk->gid; | |
489 | context->euid = tsk->euid; | |
490 | context->suid = tsk->suid; | |
491 | context->fsuid = tsk->fsuid; | |
492 | context->egid = tsk->egid; | |
493 | context->sgid = tsk->sgid; | |
494 | context->fsgid = tsk->fsgid; | |
495 | context->personality = tsk->personality; | |
496 | tsk->audit_context = NULL; | |
497 | return context; | |
498 | } | |
499 | ||
500 | static inline void audit_free_names(struct audit_context *context) | |
501 | { | |
502 | int i; | |
503 | ||
504 | #if AUDIT_DEBUG == 2 | |
505 | if (context->auditable | |
506 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 507 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
508 | " name_count=%d put_count=%d" |
509 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 510 | __FILE__, __LINE__, |
1da177e4 LT |
511 | context->serial, context->major, context->in_syscall, |
512 | context->name_count, context->put_count, | |
513 | context->ino_count); | |
8c8570fb | 514 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
515 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
516 | context->names[i].name, | |
73241ccc | 517 | context->names[i].name ?: "(null)"); |
8c8570fb | 518 | } |
1da177e4 LT |
519 | dump_stack(); |
520 | return; | |
521 | } | |
522 | #endif | |
523 | #if AUDIT_DEBUG | |
524 | context->put_count = 0; | |
525 | context->ino_count = 0; | |
526 | #endif | |
527 | ||
8c8570fb | 528 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
529 | if (context->names[i].name) |
530 | __putname(context->names[i].name); | |
8c8570fb | 531 | } |
1da177e4 | 532 | context->name_count = 0; |
8f37d47c DW |
533 | if (context->pwd) |
534 | dput(context->pwd); | |
535 | if (context->pwdmnt) | |
536 | mntput(context->pwdmnt); | |
537 | context->pwd = NULL; | |
538 | context->pwdmnt = NULL; | |
1da177e4 LT |
539 | } |
540 | ||
541 | static inline void audit_free_aux(struct audit_context *context) | |
542 | { | |
543 | struct audit_aux_data *aux; | |
544 | ||
545 | while ((aux = context->aux)) { | |
01116105 SS |
546 | if (aux->type == AUDIT_AVC_PATH) { |
547 | struct audit_aux_data_path *axi = (void *)aux; | |
548 | dput(axi->dentry); | |
549 | mntput(axi->mnt); | |
550 | } | |
8c8570fb | 551 | |
1da177e4 LT |
552 | context->aux = aux->next; |
553 | kfree(aux); | |
554 | } | |
555 | } | |
556 | ||
557 | static inline void audit_zero_context(struct audit_context *context, | |
558 | enum audit_state state) | |
559 | { | |
560 | uid_t loginuid = context->loginuid; | |
561 | ||
562 | memset(context, 0, sizeof(*context)); | |
563 | context->state = state; | |
564 | context->loginuid = loginuid; | |
565 | } | |
566 | ||
567 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
568 | { | |
569 | struct audit_context *context; | |
570 | ||
571 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
572 | return NULL; | |
573 | audit_zero_context(context, state); | |
574 | return context; | |
575 | } | |
576 | ||
b0dd25a8 RD |
577 | /** |
578 | * audit_alloc - allocate an audit context block for a task | |
579 | * @tsk: task | |
580 | * | |
581 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
582 | * if necessary. Doing so turns on system call auditing for the |
583 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
584 | * needed. |
585 | */ | |
1da177e4 LT |
586 | int audit_alloc(struct task_struct *tsk) |
587 | { | |
588 | struct audit_context *context; | |
589 | enum audit_state state; | |
590 | ||
591 | if (likely(!audit_enabled)) | |
592 | return 0; /* Return if not auditing. */ | |
593 | ||
594 | state = audit_filter_task(tsk); | |
595 | if (likely(state == AUDIT_DISABLED)) | |
596 | return 0; | |
597 | ||
598 | if (!(context = audit_alloc_context(state))) { | |
599 | audit_log_lost("out of memory in audit_alloc"); | |
600 | return -ENOMEM; | |
601 | } | |
602 | ||
603 | /* Preserve login uid */ | |
604 | context->loginuid = -1; | |
605 | if (current->audit_context) | |
606 | context->loginuid = current->audit_context->loginuid; | |
607 | ||
608 | tsk->audit_context = context; | |
609 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static inline void audit_free_context(struct audit_context *context) | |
614 | { | |
615 | struct audit_context *previous; | |
616 | int count = 0; | |
617 | ||
618 | do { | |
619 | previous = context->previous; | |
620 | if (previous || (count && count < 10)) { | |
621 | ++count; | |
622 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
623 | " freeing multiple contexts (%d)\n", | |
624 | context->serial, context->major, | |
625 | context->name_count, count); | |
626 | } | |
627 | audit_free_names(context); | |
628 | audit_free_aux(context); | |
629 | kfree(context); | |
630 | context = previous; | |
631 | } while (context); | |
632 | if (count >= 10) | |
633 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
634 | } | |
635 | ||
e495149b | 636 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
637 | { |
638 | char *ctx = NULL; | |
639 | ssize_t len = 0; | |
640 | ||
641 | len = security_getprocattr(current, "current", NULL, 0); | |
642 | if (len < 0) { | |
643 | if (len != -EINVAL) | |
644 | goto error_path; | |
645 | return; | |
646 | } | |
647 | ||
e495149b | 648 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 649 | if (!ctx) |
8c8570fb | 650 | goto error_path; |
8c8570fb DK |
651 | |
652 | len = security_getprocattr(current, "current", ctx, len); | |
653 | if (len < 0 ) | |
654 | goto error_path; | |
655 | ||
656 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 657 | return; |
8c8570fb DK |
658 | |
659 | error_path: | |
660 | if (ctx) | |
661 | kfree(ctx); | |
7306a0b9 | 662 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
663 | return; |
664 | } | |
665 | ||
e495149b | 666 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 667 | { |
45d9bb0e AV |
668 | char name[sizeof(tsk->comm)]; |
669 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
670 | struct vm_area_struct *vma; |
671 | ||
e495149b AV |
672 | /* tsk == current */ |
673 | ||
45d9bb0e | 674 | get_task_comm(name, tsk); |
99e45eea DW |
675 | audit_log_format(ab, " comm="); |
676 | audit_log_untrustedstring(ab, name); | |
219f0817 | 677 | |
e495149b AV |
678 | if (mm) { |
679 | down_read(&mm->mmap_sem); | |
680 | vma = mm->mmap; | |
681 | while (vma) { | |
682 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
683 | vma->vm_file) { | |
684 | audit_log_d_path(ab, "exe=", | |
685 | vma->vm_file->f_dentry, | |
686 | vma->vm_file->f_vfsmnt); | |
687 | break; | |
688 | } | |
689 | vma = vma->vm_next; | |
219f0817 | 690 | } |
e495149b | 691 | up_read(&mm->mmap_sem); |
219f0817 | 692 | } |
e495149b | 693 | audit_log_task_context(ab); |
219f0817 SS |
694 | } |
695 | ||
e495149b | 696 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 697 | { |
9c7aa6aa | 698 | int i, call_panic = 0; |
1da177e4 | 699 | struct audit_buffer *ab; |
7551ced3 | 700 | struct audit_aux_data *aux; |
a6c043a8 | 701 | const char *tty; |
1da177e4 | 702 | |
e495149b AV |
703 | /* tsk == current */ |
704 | ||
705 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
706 | if (!ab) |
707 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
708 | audit_log_format(ab, "arch=%x syscall=%d", |
709 | context->arch, context->major); | |
1da177e4 LT |
710 | if (context->personality != PER_LINUX) |
711 | audit_log_format(ab, " per=%lx", context->personality); | |
712 | if (context->return_valid) | |
2fd6f58b DW |
713 | audit_log_format(ab, " success=%s exit=%ld", |
714 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
715 | context->return_code); | |
45d9bb0e AV |
716 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
717 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
718 | else |
719 | tty = "(none)"; | |
1da177e4 LT |
720 | audit_log_format(ab, |
721 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 722 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 723 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 724 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
725 | context->argv[0], |
726 | context->argv[1], | |
727 | context->argv[2], | |
728 | context->argv[3], | |
729 | context->name_count, | |
f46038ff | 730 | context->ppid, |
1da177e4 LT |
731 | context->pid, |
732 | context->loginuid, | |
733 | context->uid, | |
734 | context->gid, | |
735 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 736 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 737 | audit_log_task_info(ab, tsk); |
1da177e4 | 738 | audit_log_end(ab); |
1da177e4 | 739 | |
7551ced3 | 740 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 741 | |
e495149b | 742 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
743 | if (!ab) |
744 | continue; /* audit_panic has been called */ | |
745 | ||
1da177e4 | 746 | switch (aux->type) { |
20ca73bc GW |
747 | case AUDIT_MQ_OPEN: { |
748 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
749 | audit_log_format(ab, | |
750 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
751 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
752 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
753 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
754 | axi->attr.mq_curmsgs); | |
755 | break; } | |
756 | ||
757 | case AUDIT_MQ_SENDRECV: { | |
758 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
759 | audit_log_format(ab, | |
760 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
761 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
762 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
763 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
764 | break; } | |
765 | ||
766 | case AUDIT_MQ_NOTIFY: { | |
767 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
768 | audit_log_format(ab, | |
769 | "mqdes=%d sigev_signo=%d", | |
770 | axi->mqdes, | |
771 | axi->notification.sigev_signo); | |
772 | break; } | |
773 | ||
774 | case AUDIT_MQ_GETSETATTR: { | |
775 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
776 | audit_log_format(ab, | |
777 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
778 | "mq_curmsgs=%ld ", | |
779 | axi->mqdes, | |
780 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
781 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
782 | break; } | |
783 | ||
c0404993 | 784 | case AUDIT_IPC: { |
1da177e4 LT |
785 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
786 | audit_log_format(ab, | |
ac03221a LK |
787 | "ouid=%u ogid=%u mode=%x", |
788 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
789 | if (axi->osid != 0) { |
790 | char *ctx = NULL; | |
791 | u32 len; | |
792 | if (selinux_ctxid_to_string( | |
793 | axi->osid, &ctx, &len)) { | |
ce29b682 | 794 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
795 | axi->osid); |
796 | call_panic = 1; | |
797 | } else | |
798 | audit_log_format(ab, " obj=%s", ctx); | |
799 | kfree(ctx); | |
800 | } | |
3ec3b2fb DW |
801 | break; } |
802 | ||
073115d6 SG |
803 | case AUDIT_IPC_SET_PERM: { |
804 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
805 | audit_log_format(ab, | |
ac03221a | 806 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 807 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 808 | break; } |
ac03221a | 809 | |
473ae30b AV |
810 | case AUDIT_EXECVE: { |
811 | struct audit_aux_data_execve *axi = (void *)aux; | |
812 | int i; | |
813 | const char *p; | |
814 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
815 | audit_log_format(ab, "a%d=", i); | |
816 | p = audit_log_untrustedstring(ab, p); | |
817 | audit_log_format(ab, "\n"); | |
818 | } | |
819 | break; } | |
073115d6 | 820 | |
3ec3b2fb DW |
821 | case AUDIT_SOCKETCALL: { |
822 | int i; | |
823 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
824 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
825 | for (i=0; i<axs->nargs; i++) | |
826 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
827 | break; } | |
828 | ||
829 | case AUDIT_SOCKADDR: { | |
830 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
831 | ||
832 | audit_log_format(ab, "saddr="); | |
833 | audit_log_hex(ab, axs->a, axs->len); | |
834 | break; } | |
01116105 SS |
835 | |
836 | case AUDIT_AVC_PATH: { | |
837 | struct audit_aux_data_path *axi = (void *)aux; | |
838 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
839 | break; } |
840 | ||
1da177e4 LT |
841 | } |
842 | audit_log_end(ab); | |
1da177e4 LT |
843 | } |
844 | ||
8f37d47c | 845 | if (context->pwd && context->pwdmnt) { |
e495149b | 846 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
847 | if (ab) { |
848 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
849 | audit_log_end(ab); | |
850 | } | |
851 | } | |
1da177e4 | 852 | for (i = 0; i < context->name_count; i++) { |
73241ccc AG |
853 | unsigned long ino = context->names[i].ino; |
854 | unsigned long pino = context->names[i].pino; | |
855 | ||
e495149b | 856 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
857 | if (!ab) |
858 | continue; /* audit_panic has been called */ | |
8f37d47c | 859 | |
1da177e4 | 860 | audit_log_format(ab, "item=%d", i); |
73241ccc AG |
861 | |
862 | audit_log_format(ab, " name="); | |
863 | if (context->names[i].name) | |
83c7d091 | 864 | audit_log_untrustedstring(ab, context->names[i].name); |
73241ccc AG |
865 | else |
866 | audit_log_format(ab, "(null)"); | |
867 | ||
868 | if (pino != (unsigned long)-1) | |
869 | audit_log_format(ab, " parent=%lu", pino); | |
870 | if (ino != (unsigned long)-1) | |
871 | audit_log_format(ab, " inode=%lu", ino); | |
872 | if ((pino != (unsigned long)-1) || (ino != (unsigned long)-1)) | |
873 | audit_log_format(ab, " dev=%02x:%02x mode=%#o" | |
874 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
875 | MAJOR(context->names[i].dev), | |
876 | MINOR(context->names[i].dev), | |
877 | context->names[i].mode, | |
878 | context->names[i].uid, | |
879 | context->names[i].gid, | |
880 | MAJOR(context->names[i].rdev), | |
1da177e4 | 881 | MINOR(context->names[i].rdev)); |
1b50eed9 SG |
882 | if (context->names[i].osid != 0) { |
883 | char *ctx = NULL; | |
884 | u32 len; | |
885 | if (selinux_ctxid_to_string( | |
886 | context->names[i].osid, &ctx, &len)) { | |
ce29b682 | 887 | audit_log_format(ab, " osid=%u", |
1b50eed9 | 888 | context->names[i].osid); |
9c7aa6aa | 889 | call_panic = 2; |
1b50eed9 SG |
890 | } else |
891 | audit_log_format(ab, " obj=%s", ctx); | |
892 | kfree(ctx); | |
8c8570fb DK |
893 | } |
894 | ||
1da177e4 LT |
895 | audit_log_end(ab); |
896 | } | |
9c7aa6aa SG |
897 | if (call_panic) |
898 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
899 | } |
900 | ||
b0dd25a8 RD |
901 | /** |
902 | * audit_free - free a per-task audit context | |
903 | * @tsk: task whose audit context block to free | |
904 | * | |
fa84cb93 | 905 | * Called from copy_process and do_exit |
b0dd25a8 | 906 | */ |
1da177e4 LT |
907 | void audit_free(struct task_struct *tsk) |
908 | { | |
909 | struct audit_context *context; | |
910 | ||
1da177e4 | 911 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
912 | if (likely(!context)) |
913 | return; | |
914 | ||
915 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
916 | * function (e.g., exit_group), then free context block. |
917 | * We use GFP_ATOMIC here because we might be doing this | |
918 | * in the context of the idle thread */ | |
e495149b | 919 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 920 | if (context->in_syscall && context->auditable) |
e495149b | 921 | audit_log_exit(context, tsk); |
1da177e4 LT |
922 | |
923 | audit_free_context(context); | |
924 | } | |
925 | ||
b0dd25a8 RD |
926 | /** |
927 | * audit_syscall_entry - fill in an audit record at syscall entry | |
928 | * @tsk: task being audited | |
929 | * @arch: architecture type | |
930 | * @major: major syscall type (function) | |
931 | * @a1: additional syscall register 1 | |
932 | * @a2: additional syscall register 2 | |
933 | * @a3: additional syscall register 3 | |
934 | * @a4: additional syscall register 4 | |
935 | * | |
936 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
937 | * audit context was created when the task was created and the state or |
938 | * filters demand the audit context be built. If the state from the | |
939 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
940 | * then the record will be written at syscall exit time (otherwise, it | |
941 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
942 | * be written). |
943 | */ | |
5411be59 | 944 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
945 | unsigned long a1, unsigned long a2, |
946 | unsigned long a3, unsigned long a4) | |
947 | { | |
5411be59 | 948 | struct task_struct *tsk = current; |
1da177e4 LT |
949 | struct audit_context *context = tsk->audit_context; |
950 | enum audit_state state; | |
951 | ||
952 | BUG_ON(!context); | |
953 | ||
b0dd25a8 RD |
954 | /* |
955 | * This happens only on certain architectures that make system | |
1da177e4 LT |
956 | * calls in kernel_thread via the entry.S interface, instead of |
957 | * with direct calls. (If you are porting to a new | |
958 | * architecture, hitting this condition can indicate that you | |
959 | * got the _exit/_leave calls backward in entry.S.) | |
960 | * | |
961 | * i386 no | |
962 | * x86_64 no | |
2ef9481e | 963 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
964 | * |
965 | * This also happens with vm86 emulation in a non-nested manner | |
966 | * (entries without exits), so this case must be caught. | |
967 | */ | |
968 | if (context->in_syscall) { | |
969 | struct audit_context *newctx; | |
970 | ||
1da177e4 LT |
971 | #if AUDIT_DEBUG |
972 | printk(KERN_ERR | |
973 | "audit(:%d) pid=%d in syscall=%d;" | |
974 | " entering syscall=%d\n", | |
975 | context->serial, tsk->pid, context->major, major); | |
976 | #endif | |
977 | newctx = audit_alloc_context(context->state); | |
978 | if (newctx) { | |
979 | newctx->previous = context; | |
980 | context = newctx; | |
981 | tsk->audit_context = newctx; | |
982 | } else { | |
983 | /* If we can't alloc a new context, the best we | |
984 | * can do is to leak memory (any pending putname | |
985 | * will be lost). The only other alternative is | |
986 | * to abandon auditing. */ | |
987 | audit_zero_context(context, context->state); | |
988 | } | |
989 | } | |
990 | BUG_ON(context->in_syscall || context->name_count); | |
991 | ||
992 | if (!audit_enabled) | |
993 | return; | |
994 | ||
2fd6f58b | 995 | context->arch = arch; |
1da177e4 LT |
996 | context->major = major; |
997 | context->argv[0] = a1; | |
998 | context->argv[1] = a2; | |
999 | context->argv[2] = a3; | |
1000 | context->argv[3] = a4; | |
1001 | ||
1002 | state = context->state; | |
1003 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 1004 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1005 | if (likely(state == AUDIT_DISABLED)) |
1006 | return; | |
1007 | ||
ce625a80 | 1008 | context->serial = 0; |
1da177e4 LT |
1009 | context->ctime = CURRENT_TIME; |
1010 | context->in_syscall = 1; | |
1011 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
1012 | } | |
1013 | ||
b0dd25a8 RD |
1014 | /** |
1015 | * audit_syscall_exit - deallocate audit context after a system call | |
1016 | * @tsk: task being audited | |
1017 | * @valid: success/failure flag | |
1018 | * @return_code: syscall return value | |
1019 | * | |
1020 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1021 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1022 | * filtering, or because some other part of the kernel write an audit | |
1023 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1024 | * free the names stored from getname(). |
1025 | */ | |
5411be59 | 1026 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1027 | { |
5411be59 | 1028 | struct task_struct *tsk = current; |
1da177e4 LT |
1029 | struct audit_context *context; |
1030 | ||
2fd6f58b | 1031 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1032 | |
1da177e4 | 1033 | if (likely(!context)) |
97e94c45 | 1034 | return; |
1da177e4 | 1035 | |
f7056d64 | 1036 | if (context->in_syscall && context->auditable) |
e495149b | 1037 | audit_log_exit(context, tsk); |
1da177e4 LT |
1038 | |
1039 | context->in_syscall = 0; | |
1040 | context->auditable = 0; | |
2fd6f58b | 1041 | |
1da177e4 LT |
1042 | if (context->previous) { |
1043 | struct audit_context *new_context = context->previous; | |
1044 | context->previous = NULL; | |
1045 | audit_free_context(context); | |
1046 | tsk->audit_context = new_context; | |
1047 | } else { | |
1048 | audit_free_names(context); | |
1049 | audit_free_aux(context); | |
1da177e4 LT |
1050 | tsk->audit_context = context; |
1051 | } | |
1da177e4 LT |
1052 | } |
1053 | ||
b0dd25a8 RD |
1054 | /** |
1055 | * audit_getname - add a name to the list | |
1056 | * @name: name to add | |
1057 | * | |
1058 | * Add a name to the list of audit names for this context. | |
1059 | * Called from fs/namei.c:getname(). | |
1060 | */ | |
d8945bb5 | 1061 | void __audit_getname(const char *name) |
1da177e4 LT |
1062 | { |
1063 | struct audit_context *context = current->audit_context; | |
1064 | ||
d8945bb5 | 1065 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1066 | return; |
1067 | ||
1068 | if (!context->in_syscall) { | |
1069 | #if AUDIT_DEBUG == 2 | |
1070 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1071 | __FILE__, __LINE__, context->serial, name); | |
1072 | dump_stack(); | |
1073 | #endif | |
1074 | return; | |
1075 | } | |
1076 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1077 | context->names[context->name_count].name = name; | |
1078 | context->names[context->name_count].ino = (unsigned long)-1; | |
1079 | ++context->name_count; | |
8f37d47c DW |
1080 | if (!context->pwd) { |
1081 | read_lock(¤t->fs->lock); | |
1082 | context->pwd = dget(current->fs->pwd); | |
1083 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1084 | read_unlock(¤t->fs->lock); | |
1085 | } | |
1086 | ||
1da177e4 LT |
1087 | } |
1088 | ||
b0dd25a8 RD |
1089 | /* audit_putname - intercept a putname request |
1090 | * @name: name to intercept and delay for putname | |
1091 | * | |
1092 | * If we have stored the name from getname in the audit context, | |
1093 | * then we delay the putname until syscall exit. | |
1094 | * Called from include/linux/fs.h:putname(). | |
1095 | */ | |
1da177e4 LT |
1096 | void audit_putname(const char *name) |
1097 | { | |
1098 | struct audit_context *context = current->audit_context; | |
1099 | ||
1100 | BUG_ON(!context); | |
1101 | if (!context->in_syscall) { | |
1102 | #if AUDIT_DEBUG == 2 | |
1103 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1104 | __FILE__, __LINE__, context->serial, name); | |
1105 | if (context->name_count) { | |
1106 | int i; | |
1107 | for (i = 0; i < context->name_count; i++) | |
1108 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1109 | context->names[i].name, | |
73241ccc | 1110 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1111 | } |
1112 | #endif | |
1113 | __putname(name); | |
1114 | } | |
1115 | #if AUDIT_DEBUG | |
1116 | else { | |
1117 | ++context->put_count; | |
1118 | if (context->put_count > context->name_count) { | |
1119 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1120 | " in_syscall=%d putname(%p) name_count=%d" | |
1121 | " put_count=%d\n", | |
1122 | __FILE__, __LINE__, | |
1123 | context->serial, context->major, | |
1124 | context->in_syscall, name, context->name_count, | |
1125 | context->put_count); | |
1126 | dump_stack(); | |
1127 | } | |
1128 | } | |
1129 | #endif | |
1130 | } | |
1131 | ||
9c7aa6aa | 1132 | static void audit_inode_context(int idx, const struct inode *inode) |
8c8570fb DK |
1133 | { |
1134 | struct audit_context *context = current->audit_context; | |
8c8570fb | 1135 | |
1b50eed9 | 1136 | selinux_get_inode_sid(inode, &context->names[idx].osid); |
8c8570fb DK |
1137 | } |
1138 | ||
1139 | ||
b0dd25a8 RD |
1140 | /** |
1141 | * audit_inode - store the inode and device from a lookup | |
1142 | * @name: name being audited | |
1143 | * @inode: inode being audited | |
1144 | * @flags: lookup flags (as used in path_lookup()) | |
1145 | * | |
1146 | * Called from fs/namei.c:path_lookup(). | |
1147 | */ | |
73241ccc | 1148 | void __audit_inode(const char *name, const struct inode *inode, unsigned flags) |
1da177e4 LT |
1149 | { |
1150 | int idx; | |
1151 | struct audit_context *context = current->audit_context; | |
1152 | ||
1153 | if (!context->in_syscall) | |
1154 | return; | |
1155 | if (context->name_count | |
1156 | && context->names[context->name_count-1].name | |
1157 | && context->names[context->name_count-1].name == name) | |
1158 | idx = context->name_count - 1; | |
1159 | else if (context->name_count > 1 | |
1160 | && context->names[context->name_count-2].name | |
1161 | && context->names[context->name_count-2].name == name) | |
1162 | idx = context->name_count - 2; | |
1163 | else { | |
1164 | /* FIXME: how much do we care about inodes that have no | |
1165 | * associated name? */ | |
1166 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1167 | return; | |
1168 | idx = context->name_count++; | |
1169 | context->names[idx].name = NULL; | |
1170 | #if AUDIT_DEBUG | |
1171 | ++context->ino_count; | |
1172 | #endif | |
1173 | } | |
ae7b961b DW |
1174 | context->names[idx].dev = inode->i_sb->s_dev; |
1175 | context->names[idx].mode = inode->i_mode; | |
1176 | context->names[idx].uid = inode->i_uid; | |
1177 | context->names[idx].gid = inode->i_gid; | |
1178 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1179 | audit_inode_context(idx, inode); |
73241ccc AG |
1180 | if ((flags & LOOKUP_PARENT) && (strcmp(name, "/") != 0) && |
1181 | (strcmp(name, ".") != 0)) { | |
1182 | context->names[idx].ino = (unsigned long)-1; | |
1183 | context->names[idx].pino = inode->i_ino; | |
1184 | } else { | |
1185 | context->names[idx].ino = inode->i_ino; | |
1186 | context->names[idx].pino = (unsigned long)-1; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | /** | |
1191 | * audit_inode_child - collect inode info for created/removed objects | |
1192 | * @dname: inode's dentry name | |
1193 | * @inode: inode being audited | |
1194 | * @pino: inode number of dentry parent | |
1195 | * | |
1196 | * For syscalls that create or remove filesystem objects, audit_inode | |
1197 | * can only collect information for the filesystem object's parent. | |
1198 | * This call updates the audit context with the child's information. | |
1199 | * Syscalls that create a new filesystem object must be hooked after | |
1200 | * the object is created. Syscalls that remove a filesystem object | |
1201 | * must be hooked prior, in order to capture the target inode during | |
1202 | * unsuccessful attempts. | |
1203 | */ | |
1204 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
1205 | unsigned long pino) | |
1206 | { | |
1207 | int idx; | |
1208 | struct audit_context *context = current->audit_context; | |
1209 | ||
1210 | if (!context->in_syscall) | |
1211 | return; | |
1212 | ||
1213 | /* determine matching parent */ | |
f368c07d AG |
1214 | if (!dname) |
1215 | goto no_match; | |
1216 | for (idx = 0; idx < context->name_count; idx++) | |
1217 | if (context->names[idx].pino == pino) { | |
1218 | const char *name = context->names[idx].name; | |
73241ccc | 1219 | |
f368c07d AG |
1220 | if (!name) |
1221 | continue; | |
1222 | ||
1223 | if (audit_compare_dname_path(dname, name) == 0) | |
1224 | goto update_context; | |
1225 | } | |
73241ccc | 1226 | |
f368c07d | 1227 | no_match: |
73241ccc AG |
1228 | /* catch-all in case match not found */ |
1229 | idx = context->name_count++; | |
1230 | context->names[idx].name = NULL; | |
1231 | context->names[idx].pino = pino; | |
1232 | #if AUDIT_DEBUG | |
1233 | context->ino_count++; | |
1234 | #endif | |
1235 | ||
1236 | update_context: | |
1237 | if (inode) { | |
1238 | context->names[idx].ino = inode->i_ino; | |
1239 | context->names[idx].dev = inode->i_sb->s_dev; | |
1240 | context->names[idx].mode = inode->i_mode; | |
1241 | context->names[idx].uid = inode->i_uid; | |
1242 | context->names[idx].gid = inode->i_gid; | |
1243 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1244 | audit_inode_context(idx, inode); |
73241ccc | 1245 | } |
1da177e4 LT |
1246 | } |
1247 | ||
b0dd25a8 RD |
1248 | /** |
1249 | * auditsc_get_stamp - get local copies of audit_context values | |
1250 | * @ctx: audit_context for the task | |
1251 | * @t: timespec to store time recorded in the audit_context | |
1252 | * @serial: serial value that is recorded in the audit_context | |
1253 | * | |
1254 | * Also sets the context as auditable. | |
1255 | */ | |
bfb4496e DW |
1256 | void auditsc_get_stamp(struct audit_context *ctx, |
1257 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1258 | { |
ce625a80 DW |
1259 | if (!ctx->serial) |
1260 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1261 | t->tv_sec = ctx->ctime.tv_sec; |
1262 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1263 | *serial = ctx->serial; | |
1264 | ctx->auditable = 1; | |
1da177e4 LT |
1265 | } |
1266 | ||
b0dd25a8 RD |
1267 | /** |
1268 | * audit_set_loginuid - set a task's audit_context loginuid | |
1269 | * @task: task whose audit context is being modified | |
1270 | * @loginuid: loginuid value | |
1271 | * | |
1272 | * Returns 0. | |
1273 | * | |
1274 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1275 | */ | |
456be6cd | 1276 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1277 | { |
456be6cd | 1278 | if (task->audit_context) { |
c0404993 SG |
1279 | struct audit_buffer *ab; |
1280 | ||
9ad9ad38 | 1281 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
c0404993 SG |
1282 | if (ab) { |
1283 | audit_log_format(ab, "login pid=%d uid=%u " | |
326e9c8b | 1284 | "old auid=%u new auid=%u", |
c0404993 SG |
1285 | task->pid, task->uid, |
1286 | task->audit_context->loginuid, loginuid); | |
1287 | audit_log_end(ab); | |
1288 | } | |
456be6cd | 1289 | task->audit_context->loginuid = loginuid; |
1da177e4 LT |
1290 | } |
1291 | return 0; | |
1292 | } | |
1293 | ||
b0dd25a8 RD |
1294 | /** |
1295 | * audit_get_loginuid - get the loginuid for an audit_context | |
1296 | * @ctx: the audit_context | |
1297 | * | |
1298 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1299 | */ | |
1da177e4 LT |
1300 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1301 | { | |
1302 | return ctx ? ctx->loginuid : -1; | |
1303 | } | |
1304 | ||
20ca73bc GW |
1305 | /** |
1306 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1307 | * @oflag: open flag | |
1308 | * @mode: mode bits | |
1309 | * @u_attr: queue attributes | |
1310 | * | |
1311 | * Returns 0 for success or NULL context or < 0 on error. | |
1312 | */ | |
1313 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1314 | { | |
1315 | struct audit_aux_data_mq_open *ax; | |
1316 | struct audit_context *context = current->audit_context; | |
1317 | ||
1318 | if (!audit_enabled) | |
1319 | return 0; | |
1320 | ||
1321 | if (likely(!context)) | |
1322 | return 0; | |
1323 | ||
1324 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1325 | if (!ax) | |
1326 | return -ENOMEM; | |
1327 | ||
1328 | if (u_attr != NULL) { | |
1329 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1330 | kfree(ax); | |
1331 | return -EFAULT; | |
1332 | } | |
1333 | } else | |
1334 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1335 | ||
1336 | ax->oflag = oflag; | |
1337 | ax->mode = mode; | |
1338 | ||
1339 | ax->d.type = AUDIT_MQ_OPEN; | |
1340 | ax->d.next = context->aux; | |
1341 | context->aux = (void *)ax; | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1347 | * @mqdes: MQ descriptor | |
1348 | * @msg_len: Message length | |
1349 | * @msg_prio: Message priority | |
1350 | * @abs_timeout: Message timeout in absolute time | |
1351 | * | |
1352 | * Returns 0 for success or NULL context or < 0 on error. | |
1353 | */ | |
1354 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1355 | const struct timespec __user *u_abs_timeout) | |
1356 | { | |
1357 | struct audit_aux_data_mq_sendrecv *ax; | |
1358 | struct audit_context *context = current->audit_context; | |
1359 | ||
1360 | if (!audit_enabled) | |
1361 | return 0; | |
1362 | ||
1363 | if (likely(!context)) | |
1364 | return 0; | |
1365 | ||
1366 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1367 | if (!ax) | |
1368 | return -ENOMEM; | |
1369 | ||
1370 | if (u_abs_timeout != NULL) { | |
1371 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1372 | kfree(ax); | |
1373 | return -EFAULT; | |
1374 | } | |
1375 | } else | |
1376 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1377 | ||
1378 | ax->mqdes = mqdes; | |
1379 | ax->msg_len = msg_len; | |
1380 | ax->msg_prio = msg_prio; | |
1381 | ||
1382 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1383 | ax->d.next = context->aux; | |
1384 | context->aux = (void *)ax; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1390 | * @mqdes: MQ descriptor | |
1391 | * @msg_len: Message length | |
1392 | * @msg_prio: Message priority | |
1393 | * @abs_timeout: Message timeout in absolute time | |
1394 | * | |
1395 | * Returns 0 for success or NULL context or < 0 on error. | |
1396 | */ | |
1397 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1398 | unsigned int __user *u_msg_prio, | |
1399 | const struct timespec __user *u_abs_timeout) | |
1400 | { | |
1401 | struct audit_aux_data_mq_sendrecv *ax; | |
1402 | struct audit_context *context = current->audit_context; | |
1403 | ||
1404 | if (!audit_enabled) | |
1405 | return 0; | |
1406 | ||
1407 | if (likely(!context)) | |
1408 | return 0; | |
1409 | ||
1410 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1411 | if (!ax) | |
1412 | return -ENOMEM; | |
1413 | ||
1414 | if (u_msg_prio != NULL) { | |
1415 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1416 | kfree(ax); | |
1417 | return -EFAULT; | |
1418 | } | |
1419 | } else | |
1420 | ax->msg_prio = 0; | |
1421 | ||
1422 | if (u_abs_timeout != NULL) { | |
1423 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1424 | kfree(ax); | |
1425 | return -EFAULT; | |
1426 | } | |
1427 | } else | |
1428 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1429 | ||
1430 | ax->mqdes = mqdes; | |
1431 | ax->msg_len = msg_len; | |
1432 | ||
1433 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1434 | ax->d.next = context->aux; | |
1435 | context->aux = (void *)ax; | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | /** | |
1440 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1441 | * @mqdes: MQ descriptor | |
1442 | * @u_notification: Notification event | |
1443 | * | |
1444 | * Returns 0 for success or NULL context or < 0 on error. | |
1445 | */ | |
1446 | ||
1447 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1448 | { | |
1449 | struct audit_aux_data_mq_notify *ax; | |
1450 | struct audit_context *context = current->audit_context; | |
1451 | ||
1452 | if (!audit_enabled) | |
1453 | return 0; | |
1454 | ||
1455 | if (likely(!context)) | |
1456 | return 0; | |
1457 | ||
1458 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1459 | if (!ax) | |
1460 | return -ENOMEM; | |
1461 | ||
1462 | if (u_notification != NULL) { | |
1463 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1464 | kfree(ax); | |
1465 | return -EFAULT; | |
1466 | } | |
1467 | } else | |
1468 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1469 | ||
1470 | ax->mqdes = mqdes; | |
1471 | ||
1472 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1473 | ax->d.next = context->aux; | |
1474 | context->aux = (void *)ax; | |
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | /** | |
1479 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1480 | * @mqdes: MQ descriptor | |
1481 | * @mqstat: MQ flags | |
1482 | * | |
1483 | * Returns 0 for success or NULL context or < 0 on error. | |
1484 | */ | |
1485 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1486 | { | |
1487 | struct audit_aux_data_mq_getsetattr *ax; | |
1488 | struct audit_context *context = current->audit_context; | |
1489 | ||
1490 | if (!audit_enabled) | |
1491 | return 0; | |
1492 | ||
1493 | if (likely(!context)) | |
1494 | return 0; | |
1495 | ||
1496 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1497 | if (!ax) | |
1498 | return -ENOMEM; | |
1499 | ||
1500 | ax->mqdes = mqdes; | |
1501 | ax->mqstat = *mqstat; | |
1502 | ||
1503 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1504 | ax->d.next = context->aux; | |
1505 | context->aux = (void *)ax; | |
1506 | return 0; | |
1507 | } | |
1508 | ||
b0dd25a8 | 1509 | /** |
073115d6 SG |
1510 | * audit_ipc_obj - record audit data for ipc object |
1511 | * @ipcp: ipc permissions | |
1512 | * | |
1513 | * Returns 0 for success or NULL context or < 0 on error. | |
1514 | */ | |
d8945bb5 | 1515 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1516 | { |
1517 | struct audit_aux_data_ipcctl *ax; | |
1518 | struct audit_context *context = current->audit_context; | |
1519 | ||
073115d6 SG |
1520 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1521 | if (!ax) | |
1522 | return -ENOMEM; | |
1523 | ||
1524 | ax->uid = ipcp->uid; | |
1525 | ax->gid = ipcp->gid; | |
1526 | ax->mode = ipcp->mode; | |
1527 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1528 | ||
1529 | ax->d.type = AUDIT_IPC; | |
1530 | ax->d.next = context->aux; | |
1531 | context->aux = (void *)ax; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /** | |
1536 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1537 | * @qbytes: msgq bytes |
1538 | * @uid: msgq user id | |
1539 | * @gid: msgq group id | |
1540 | * @mode: msgq mode (permissions) | |
1541 | * | |
1542 | * Returns 0 for success or NULL context or < 0 on error. | |
1543 | */ | |
d8945bb5 | 1544 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1545 | { |
1546 | struct audit_aux_data_ipcctl *ax; | |
1547 | struct audit_context *context = current->audit_context; | |
1548 | ||
8c8570fb | 1549 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1550 | if (!ax) |
1551 | return -ENOMEM; | |
1552 | ||
1553 | ax->qbytes = qbytes; | |
1554 | ax->uid = uid; | |
1555 | ax->gid = gid; | |
1556 | ax->mode = mode; | |
1557 | ||
073115d6 | 1558 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1559 | ax->d.next = context->aux; |
1560 | context->aux = (void *)ax; | |
1561 | return 0; | |
1562 | } | |
c2f0c7c3 | 1563 | |
473ae30b AV |
1564 | int audit_bprm(struct linux_binprm *bprm) |
1565 | { | |
1566 | struct audit_aux_data_execve *ax; | |
1567 | struct audit_context *context = current->audit_context; | |
1568 | unsigned long p, next; | |
1569 | void *to; | |
1570 | ||
1571 | if (likely(!audit_enabled || !context)) | |
1572 | return 0; | |
1573 | ||
1574 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1575 | GFP_KERNEL); | |
1576 | if (!ax) | |
1577 | return -ENOMEM; | |
1578 | ||
1579 | ax->argc = bprm->argc; | |
1580 | ax->envc = bprm->envc; | |
1581 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1582 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1583 | void *kaddr = kmap(page); | |
1584 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1585 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1586 | to += next - p; | |
1587 | kunmap(page); | |
1588 | } | |
1589 | ||
1590 | ax->d.type = AUDIT_EXECVE; | |
1591 | ax->d.next = context->aux; | |
1592 | context->aux = (void *)ax; | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | ||
b0dd25a8 RD |
1597 | /** |
1598 | * audit_socketcall - record audit data for sys_socketcall | |
1599 | * @nargs: number of args | |
1600 | * @args: args array | |
1601 | * | |
1602 | * Returns 0 for success or NULL context or < 0 on error. | |
1603 | */ | |
3ec3b2fb DW |
1604 | int audit_socketcall(int nargs, unsigned long *args) |
1605 | { | |
1606 | struct audit_aux_data_socketcall *ax; | |
1607 | struct audit_context *context = current->audit_context; | |
1608 | ||
1609 | if (likely(!context)) | |
1610 | return 0; | |
1611 | ||
1612 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1613 | if (!ax) | |
1614 | return -ENOMEM; | |
1615 | ||
1616 | ax->nargs = nargs; | |
1617 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1618 | ||
1619 | ax->d.type = AUDIT_SOCKETCALL; | |
1620 | ax->d.next = context->aux; | |
1621 | context->aux = (void *)ax; | |
1622 | return 0; | |
1623 | } | |
1624 | ||
b0dd25a8 RD |
1625 | /** |
1626 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1627 | * @len: data length in user space | |
1628 | * @a: data address in kernel space | |
1629 | * | |
1630 | * Returns 0 for success or NULL context or < 0 on error. | |
1631 | */ | |
3ec3b2fb DW |
1632 | int audit_sockaddr(int len, void *a) |
1633 | { | |
1634 | struct audit_aux_data_sockaddr *ax; | |
1635 | struct audit_context *context = current->audit_context; | |
1636 | ||
1637 | if (likely(!context)) | |
1638 | return 0; | |
1639 | ||
1640 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1641 | if (!ax) | |
1642 | return -ENOMEM; | |
1643 | ||
1644 | ax->len = len; | |
1645 | memcpy(ax->a, a, len); | |
1646 | ||
1647 | ax->d.type = AUDIT_SOCKADDR; | |
1648 | ax->d.next = context->aux; | |
1649 | context->aux = (void *)ax; | |
1650 | return 0; | |
1651 | } | |
1652 | ||
b0dd25a8 RD |
1653 | /** |
1654 | * audit_avc_path - record the granting or denial of permissions | |
1655 | * @dentry: dentry to record | |
1656 | * @mnt: mnt to record | |
1657 | * | |
1658 | * Returns 0 for success or NULL context or < 0 on error. | |
1659 | * | |
1660 | * Called from security/selinux/avc.c::avc_audit() | |
1661 | */ | |
01116105 SS |
1662 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1663 | { | |
1664 | struct audit_aux_data_path *ax; | |
1665 | struct audit_context *context = current->audit_context; | |
1666 | ||
1667 | if (likely(!context)) | |
1668 | return 0; | |
1669 | ||
1670 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1671 | if (!ax) | |
1672 | return -ENOMEM; | |
1673 | ||
1674 | ax->dentry = dget(dentry); | |
1675 | ax->mnt = mntget(mnt); | |
1676 | ||
1677 | ax->d.type = AUDIT_AVC_PATH; | |
1678 | ax->d.next = context->aux; | |
1679 | context->aux = (void *)ax; | |
1680 | return 0; | |
1681 | } | |
1682 | ||
b0dd25a8 RD |
1683 | /** |
1684 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1685 | * @sig: signal value | |
1686 | * @t: task being signaled | |
1687 | * | |
1688 | * If the audit subsystem is being terminated, record the task (pid) | |
1689 | * and uid that is doing that. | |
1690 | */ | |
e1396065 | 1691 | void __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 SG |
1692 | { |
1693 | extern pid_t audit_sig_pid; | |
1694 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1695 | extern u32 audit_sig_sid; |
1696 | ||
1697 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { | |
1698 | struct task_struct *tsk = current; | |
1699 | struct audit_context *ctx = tsk->audit_context; | |
1700 | audit_sig_pid = tsk->pid; | |
1701 | if (ctx) | |
1702 | audit_sig_uid = ctx->loginuid; | |
1703 | else | |
1704 | audit_sig_uid = tsk->uid; | |
1705 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 SG |
1706 | } |
1707 | } |